Ch.15 #69-74, 87, 90, 95, 97, 99, 143, 144
69) A good indicator for #53 (SA,SB) could be Bromothymol blue
or Phenol Red, or Alizarin.
A good indicator for #55 (WA,SB) could be phenolphthalein
70) A good indicator for #54 (SA,SB) could be Bromothymol blue